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Paper 2017/1021
Bricklayer Attack: A Side-Channel Analysis on the ChaCha Quarter Round
Alexandre Adomnicai and Jacques J.A. Fournier and Laurent Masson
Abstract
ChaCha is a family of stream ciphers that are very efficient on constrainted platforms. In this paper, we present electromagnetic side-channel analyses for two different software implementations of ChaCha20 on a 32-bit architecture: one compiled and another one directly written in assembly. On the device under test, practical experiments show that they have different levels of resistance to side-channel attacks. For the most leakage-resilient implementation, an analysis of the whole quarter round is required. To overcome this complication, we introduce an optimized attack based on a divide-and-conquer strategy named bricklayer attack.
Metadata
- Available format(s)
- Category
- Implementation
- Publication info
- Published elsewhere. Minor revision. INDOCRYPT 2017
- Contact author(s)
- a adomnicai @ trusted-objects com
- History
- 2019-03-27: last of 2 revisions
- 2017-10-25: received
- See all versions
- Short URL
- https://ia.cr/2017/1021
- License
-
CC BY